Abstract
A new thermodynamics of scalar-tensor gravity is applied to spatiallyhomogeneous and isotropic cosmologies in thisclass of theories and testedon analytical solutions. A forever-expanding universe approaches theEinstein “state of equilibrium” with zero effective temperature at latetimes and departs from it near spacetime singularities. “Cooling” byexpansion and “heating” by singularities compete near the Big Rip, whereit is found that the effective temperature diverges in the case ofa conformally coupled scalar field.
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